鹽度對疏水改性聚丙烯酰胺吸附行為的影響

鄒文杰; 饒博; 趙偉; 徐瑞景; 王廷

doi:10.13374/j.issn2095-9389.2022.02.19.003

鹽度對疏水改性聚丙烯酰胺吸附行為的影響

doi: 10.13374/j.issn2095-9389.2022.02.19.003

北京科技大學土木與資源工程學院，北京 100083

基金項目: 國家自然科學基金資助項目（51604019）; 中央高校基本科研業務費專項資金資助項目（FRF-IP-20-03）; 國家重點研發計劃重點專項資助項目（2020YFC1807804）

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通訊作者:
E-mail: wjzou@ustb.edu.cn

中圖分類號: TD926.2⁺1
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出版歷程
- 收稿日期: 2022-02-19
- 網絡出版日期: 2022-03-24
- 刊出日期: 2023-04-01

Effect of salinity on the adsorption behavior of hydrophobically modified polyacrylamide

School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China

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Corresponding author: E-mail: wjzou@ustb.edu.cn

摘要

摘要: 選擇性絮凝分選是微細粒礦物高效分選的重要手段之一。為了強化絮凝劑在親水、疏水礦物表面的絮凝選擇性，將疏水基團十六烷基二甲基烯丙基氯化銨（C₁₆DMAAC）引入聚丙烯酰胺（PAM）分子鏈中合成了疏水改性聚丙烯酰胺（HMPAM），采用耗散型石英晶體微天平（QCM-D）研究了不同濃度K⁺和Ca²⁺對分散劑六偏磷酸鈉（SHMP）和HMPAM在親水和疏水化表面原位吸附行為的影響，并使用激光粒度分析儀分析了不同鹽度下SHMP和HMPAM對硅微粉及疏水改性硅微粉粒徑分布的影響。結果表明，不同鹽度環境下HMPAM均呈現了較好的絮凝選擇性。背景溶液分別為10 mmol?L^?1、100 mmol?L^?1 KCl及1 mmol?L^?1 CaCl₂時，QCM-D結果表明SHMP在疏水化表面均未形成吸附層，隨后HMPAM在疏水化表面發生吸附，且隨著鹽度的增加，HMPAM的吸附量增大且吸附層的耗散性降低；背景溶液為10 mmol?L^?1 CaCl₂時，SHMP也未抑制HMPAM在疏水化表面的吸附，形成了諧振頻率變化（Δf）為?18.3 Hz的吸附層。相比，100 mmol?L^?1 KCl時1 mmol?L^?1 SHMP在SiO₂表面形成薄而致密的吸附層，隨后抑制了HMPAM的吸附；10 mmol?L^?1 CaCl₂中SHMP在SiO₂表面形成耗散的吸附層，隨后10 mmol?L^?1 CaCl₂沖洗過程中沉積了較為致密的吸附層，也抑制了HMPAM吸附。不同鹽度下SHMP和HMPAM對硅微粉及疏水化硅微粉粒徑分布的影響與QCMD試驗結果相一致。本研究是選擇性絮凝分選中絮凝劑選擇與研發的重要研究基礎。
- 疏水改性聚丙烯酰胺 /
- 石英晶體微天平 /
- 選擇性絮凝 /
- 六偏磷酸鈉 /
- 吸附行為
Abstract: Selective flocculation separation is one of the most efficient methods for fine mineral separation. To enhance the flocculation selectivity on the surfaces of hydrophilic and hydrophobic minerals, a hydrophobic group such as cetyldimethyl allyl ammonium chloride (C₁₆DMAAC) was introduced within the molecular chain of polyacrylamide (PAM) to synthesize hydrophobically modified polyacrylamide (HMPAM). The effects of different K⁺ and Ca²⁺ concentrations on the in situ adsorption behavior of dispersants such as sodium hexametaphosphate (SHMP) and HMPAM and their effect on hydrophilic and hydrophobic surfaces were studied using dissipative quartz crystal microbalance (QCM-D). The effects of SHMP and HMPAM on the particle size distribution of silicon powder and hydrophobically modified silicon powder with different salinity were analyzed using a laser particle size analyzer. Results indicated that HMPAM exhibited good flocculation selectivity at varying salinity concentrations. When the background solutions were 10 mmol?L^?1, 100 mmol?L^?1 KCl, and 1 mmol?L^?1 CaCl₂, the QCM-D results indicated that no adsorption layer of SHMP was formed on the hydrophobic surface; moreover, the HMPAM was adsorbed on the hydrophobic surface in sequence. With an increase in salinity, the adsorption of HMPAM increased, and the dissipation of the adsorption layer decreased. Moreover, in the background solution of 10 mmol?L^?1 CaCl₂, SHMP did not inhibit the adsorption of HMPAM on hydrophobic surfaces, and an adsorption layer with the change of resonant frequency (Δf) of ?18.3 Hz was formed. Conversely, a thin and dense adsorption layer of SHMP was generated on the surface of SiO₂ in 100 mmol?L^?1 KCl, which inhibited the adsorption of HMPAM. In 10 mmol?L^?1 CaCl₂, a dissipative adsorption layer of SHMP was detected on the surface of SiO₂. Furthermore, a relatively dense adsorption layer was deposited after the injection of 10 mmol?L^?1 CaCl₂ solution, which also inhibited the adsorption of HMPAM. The results of floc size measurements revealed that the position and shape of the floc size distribution peak of the silica powder did not change with the effect of SHMP and HMPAM in the background solutions of 100 mmol?L^?1 KCl and 10 mmol?L^?1 CaCl₂, thus indicating that the SHMP inhibited the flocculation of silica powder by HMPAM. The floc size of the hydrophobically modified silica powder increased with the effect of SHMP and HMPAM. Summarily, the effects of SHMP and HMPAM on the particle size distribution of silicon micro powder and hydrophobic silicon micro powder under different salinity were consistent with the results of QCM-D measurements. This study is an important research basis for selecting and developing flocculants for selective flocculation separation.
- hydrophobic modified polyacrylamide /
- quartz crystal microbalance with dissipation /
- selective flocculation /
- sodium hexametaphosphate /
- adsorption behavior

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圖 1 1 mmol?L^?1 SHMP和100 mg·L^?1 HMPAM在OTS-SiO₂表面的吸附行為. (a)10 mmol?L^?1 KCl; (b)100 mmol?L^?1 KCl

Figure 1. Effect of 1 mmol?L^?1 SHMP and 100 mg·L^?1 HMPAM on adsorption behavior of OTS-SiO₂: (a) in 10 mmol?L^?1 KCl; (b) in 100 mmol?L^?1 KCl

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圖 2 1 mmol?L^?1 SHMP和100 mg?L^?1 HMPAM在OTS-SiO₂表面的吸附行為. (a) 1 mmol?L^?1 CaCl₂; (b) 10 mmol?L^?1 CaCl₂

Figure 2. Effect of 1 mmol?L^?1 SHMP and 100 mg·L^?1 HMPAM on adsorption behavior of OTS-SiO₂: (a) in 1 mmol?L^?1 CaCl₂; (b) in 100 mmol?L^?1 CaCl₂

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圖 3 1 mmol?L^?1 SHMP和100 mg·L^?1 HMPAM在SiO₂表面的吸附行為. (a) 100 mmol?L^?1 KCl; (b) 10 mmol?L^?1 CaCl₂

Figure 3. Effect of 1 mmol?L^?1 SHMP and 100 mg·L^?1 HMPAM on adsorption behavior of SiO₂: (a) in 100 mmol?L^?1 KCl; (b) in 10 mmol?L^?1 CaCl₂

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圖 4 1 mmol?L^?1 SHMP在10 mmol?L^?1 CaCl₂溶液環境下SiO₂基底表面的SEM/EDS圖像

Figure 4. SEM/EDS imagaes of silica surface with effect of 1 mmol?L^?1 SHMP in 10 mmol?L^?1 CaCl₂ solution

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圖 5 1 mmol?L^?1 SHMP和100 mg·L^?1 HMPAM作用前后OTS-硅微粉的表觀粒徑分布. (a) 10 mmol?L^?1 KCl; (b) 100 mmol?L^?1 KCl

Figure 5. Effect of 1 mmol?L^?1 SHMP and 100 mg·L^?1 HMPAM on the floc size distribution of OTS-silica powder: (a) in 10 mmol?L^?1 KCl; (b) in 100 mmol?L^?1 KCl

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圖 6 1 mmol?L^?1 SHMP和100 mg·L^?1 HMPAM作用前后OTS-硅微粉的表觀粒徑分布. (a)1 mmol?L^?1 CaCl₂; (b) 10 mmol?L^?1 CaCl₂

Figure 6. Effect of 1 mmol?L^?1 SHMP and 100 mg·L^?1 HMPAM on floc size distribution of OTS-silica powder: (a) in 1 mmol?L^?1 CaCl₂; (b)10 mmol?L^?1 CaCl₂

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圖 7 1 mmol?L^?1 SHMP和100 mg·L^?1 HMPAM作用前后硅微粉的表觀粒徑分布. (a)100 mmol?L^?1 KCl; (b)10 mmol?L^?1 CaCl₂

Figure 7. Effect of 1 mmol?L^?1 SHMP and 100 mg·L^?1 HMPAM on floc size distribution of silica powder: (a) in 100 mmol?L^?1 KCl; (b) in 10 mmol?L^?1 CaCl₂

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